What do you think black holes are?

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A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. And i think there are many of them.Because no light can get out, people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.I think the black holes could be something like ,,a door '' to another universe . Magic beyond reality. I am very interested in subjects like this . What do you think about the Black Holes?